US Healthcare Diagnostic Firm Says 140,000 Affected by Data Breach

Catalyst published adata breach noticeon its website earlier this month, revealing that it detected suspicious activity within its secure file management system in mid-November 2025. An investigation showed that compromised credentials had been used to access data.The company’s probe showed that the files stolen by the hackers stored names, dates of birth, payment card details, medical information, and health insurance information.The Everest ransomware group claimed to have stolen roughly 12GB worth of documents from Vikor, Korgene, and KorPath.According to Catalyst’snotificationto impacted individuals, the compromised data was in its possession as a result of the medical coding and billing services it provides to Vikor Scientific, KorPath, and Korgene.Catalyst, KorPath, and Korgene have yet to share the number of impacted individuals with the HHS. It’s unclear whether 139,964 is the total number of affected people or if it’s higher.SecurityWeekhas reached out to Catalyst RCM for clarification.Related:Mississippi Hospital System Closes All Clinics After Ransomware AttackRelated:ApolloMD Data Breach Impacts 626,000 IndividualsRelated:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

The company’s probe showed that the files stolen by the hackers stored names, dates of birth, payment card details, medical information, and health insurance information.The Everest ransomware group claimed to have stolen roughly 12GB worth of documents from Vikor, Korgene, and KorPath.According to Catalyst’snotificationto impacted individuals, the compromised data was in its possession as a result of the medical coding and billing services it provides to Vikor Scientific, KorPath, and Korgene.Catalyst, KorPath, and Korgene have yet to share the number of impacted individuals with the HHS. It’s unclear whether 139,964 is the total number of affected people or if it’s higher.SecurityWeekhas reached out to Catalyst RCM for clarification.Related:Mississippi Hospital System Closes All Clinics After Ransomware AttackRelated:ApolloMD Data Breach Impacts 626,000 IndividualsRelated:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

The Everest ransomware group claimed to have stolen roughly 12GB worth of documents from Vikor, Korgene, and KorPath.According to Catalyst’snotificationto impacted individuals, the compromised data was in its possession as a result of the medical coding and billing services it provides to Vikor Scientific, KorPath, and Korgene.Catalyst, KorPath, and Korgene have yet to share the number of impacted individuals with the HHS. It’s unclear whether 139,964 is the total number of affected people or if it’s higher.SecurityWeekhas reached out to Catalyst RCM for clarification.Related:Mississippi Hospital System Closes All Clinics After Ransomware AttackRelated:ApolloMD Data Breach Impacts 626,000 IndividualsRelated:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

According to Catalyst’snotificationto impacted individuals, the compromised data was in its possession as a result of the medical coding and billing services it provides to Vikor Scientific, KorPath, and Korgene.Catalyst, KorPath, and Korgene have yet to share the number of impacted individuals with the HHS. It’s unclear whether 139,964 is the total number of affected people or if it’s higher.SecurityWeekhas reached out to Catalyst RCM for clarification.Related:Mississippi Hospital System Closes All Clinics After Ransomware AttackRelated:ApolloMD Data Breach Impacts 626,000 IndividualsRelated:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

Catalyst, KorPath, and Korgene have yet to share the number of impacted individuals with the HHS. It’s unclear whether 139,964 is the total number of affected people or if it’s higher.SecurityWeekhas reached out to Catalyst RCM for clarification.Related:Mississippi Hospital System Closes All Clinics After Ransomware AttackRelated:ApolloMD Data Breach Impacts 626,000 IndividualsRelated:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

SecurityWeekhas reached out to Catalyst RCM for clarification.Related:Mississippi Hospital System Closes All Clinics After Ransomware AttackRelated:ApolloMD Data Breach Impacts 626,000 IndividualsRelated:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

Related:Mississippi Hospital System Closes All Clinics After Ransomware AttackRelated:ApolloMD Data Breach Impacts 626,000 IndividualsRelated:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

Related:ApolloMD Data Breach Impacts 626,000 IndividualsRelated:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

Related:Central Maine Healthcare Data Breach Impacts 145,000 Individuals

Eduard Kovacs (@EduardKovacs) is the managing editor at SecurityWeek. He worked as a high school IT teacher before starting a career in journalism in 2011. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Source: SecurityWeek